Chip cutting blade



June 1967 B. w. ANDRUS ETAL 3,32 6

CHIP CUTTING BLADE Filed Jan. 12, 1965 v 5000 h 4/1 0205 61/5/74 val/4145mm ATTORNEYS.

I NVENTORS.

United States Patent 3,327,746 CHIP CUTTING BLADE Budd W. Andrus, Box3301, and Gustave A. Hallstrom, Box 3391, both of Eugene, Oreg. 97402Filed Jan. 12, 1965, Ser. No. 424,954 3 Claims. (Cl. 144-241) ABSTRACTOF THE DISCLOSURE A chip cutting blade comprising unitary member in theform of a sector of a hollow cylinder having a radially ground cuttingedge and a flat tangentially parallel cutting edge, both edges taperingtoward the end of the sector from the exterior surface to the interiorsurface is disclosed.

This invention relates to a chip cutting blade, and constitutes animprovement over our prior Patent 3,011,535 issued Dec. 5, 1961, andbearing the same title. A primary object of this invention is theprovision of an improved chip cutting blade characterized by an arcuatecross-sectional shape particularly adapted for use in apparatus forsizing lumber by removing chips instead of shavings, so that the chipsmay be utilized in the making of paper pulp, thus saving valuable paperpulp material.

A further object of the invention is the provision of such a chipcutting blade which, when employed in a blanking and chipping machinewill chip relatively large chips consisting of relatively long fibers,particularly desirable in the making of wood and paper pulp, from apiece of lumber to be blanked or sized.

A further and more specific object of the invention is the provision ofan improved blade of arcuate cross-sectional configuration characterizedby the complete absence of sharp corners at the cutting edge.

A further object of the invention is the provision of such a bladecharacterized by the absence of bolt holes therethrough, the blade beingadapted to be secured in a holder by independent securing bolts.

A still further object of the invention is the provision of a chipcutter blade of this character which is sturdy and durable inconstruction, reliable and efiicient in operation, and relativelyinexpensive to manufacture.

Still other objects will in part be obvious and in part be pointed outas the description of the invention proceeds and shown in theaccompanying drawing wherein there is disclosed a preferred embodimentof this inventive concept.

In the drawings:

FIGURE 1 is a fragmentary plan view showing a plurality of bladesconstructed in accordance with the instant invention mounted in thecutter disk of a lumber blanking and chipping machine;

FIGURE 2 is a side elevational view of a blade and holder constructed inaccordance with the instant invention showing its attachment to thedisk, the latter being indicated in dotted lines;

FIGURE 3 is a top plan view of the construction of FIGURE 2, takensubstantially along the line 3-3 of FIGURE 2, the disk being omitted;

FIGURE 4 is an end elevational view of the device of FIGURES 2 and 3taken substantially along the line 44 of FIGURE 2;

FIGURE 5 is a side elevational view of the blade per se;

FIGURE 6 is a top plan view of the blade; and FIGURE 7 is a bottom planview of the blade taken substantially along the line 77 of FIGURE 4.

Similar reference characters refer to similar parts throughout theseveral views of the drawing.

Referring now to the drawings in detail and more particularly to FIGURE1 there is indicated at 10 a fragment of a chipping disk, which maycomprise an element of a lumber blanking and chipping machine, of anydesired type, but preferably of the type indicated in our Patent2,966,182 issued Dec. 27, 1960. The disk is provided with a series ofequidistantly spaced cutaway portions 11 about the rim thereof, eachcutaway portion containing a blade holder generally indicated at 12,which receives and carries a blade, generally indicated at 15,constructed in accordance with the instant invention.

Each blade holder 12 includes a relatively flat tongue 16, havingopenings 17 therein, through which extend bolts 18, which also extendthrough aligned openings in disk 10 adjacent recesses or cutawayportions 11, for the purpose of securing the holder in position on thedisk. Extending downwardly at an incline from the outer edge of eachtongue or plate 16 and in the cutaway portion 11 adjacent thereto, is anangularly inclined portion 19, which has, as best shown in FIGURE 4, arelatively high outside edge 20, which terminates on its inner side in adownwardly facing shoulder 21 which is offset from a semicircular bladeholding recess 22. The arcuate partially circular recess 22 terminateson its opposite side in a flat portion 23, from the outside of whichextends a flange 24 at the top of a relatively low inside wall 25.Threaded bores 26 in flat portion 23 accommodate bolts 27, which securein position a blade holding block 28, generally elongated rectangularconfiguration, which has a downwardly and outwardly inclined face 29adjacent the recess 22, for the purpose of securing therein a blade 15,as will be more fully described hereinafter.

The blade of the instant invention comprises a sector of a hollowcylinder formed of an elongated concave-convex member having an outerconvex side 30 and an inner concave side 31, the outer side beingdimensioned to fit snugly within the recess 22. The side edges of themember are cut radially as at 32 to engage under the shoulder 21 and 33to seat in abutting relation with the inclined face 29 and locking block28. The forward or outer end of the member terminates in a cutting edge,the latter being formed in two portions, the lower portion seating inthe bottom of recess 22 being fiat ground from the convex outer side 30toward the inner side as indicated at 34, and the adjacent portion ofthe cutting edge which extends up the side of recess 22 and the interiorof wall 20 being radially ground, as indicated at 35. These flat andradially ground engaging surfaces provide a unique configuration ofchipping edge, wherein the flat ground portion provides a concavedcutting edge, and the radially ground portion provides a relatively fiatcutting edge, the arrangement thus being such as to sever and disengagerelatively large, long chips from the block of wood or lumber W, suchchips being particularly adapted for the previously specified purposes.

From the foregoing it will now be seen that there is herein provided animproved chipping blade and holder therefor, which accomplishes all theobjects of this invention, and others, including many advantages ofgreat practical utility and commercial importance.

As many embodiments may be made of this inventive concept, and as manymodifications may be made in the embodiment hereinbefore shown anddescribed, it is to be understood that all matter herein is to beinterpreted merely as illustrative and not in a limiting sense.

We claim:

1. A chip cutting blade for chipping wood comprising:

an elongate member in substantially the shape of ;a

sector of a hollow cylinder, having an exterior convex surface and aninterior concave surface, said surfaces being bounded by side surfacesdefining the edge of said sector;

a tapered portion from the convex exterior surface proximate an end ofthe sector to the concave interior surface at said end of the sector,said taper being radially disposed and defining a cutting edge; and

a flat portion tapering from the exterior surface to the interiorsurface, said flat portion being substantially parallel to a tangent tothe surfaces and defining an additional cutting edge along the interiorsurface.

2. The structure of claim 1 wherein the flat ground portion and theradially ground portion are approximately equidistant in extent.

References Cited UNITED STATES PATENTS 1/1960 Standal 144-2l9 6/1962Mall et a1. 143-435 DONALD R. SCHRAN, Primary Examiner

1. A CHIP CUTTING BLADE FOR CHIPPING WOOD COMPRISING: AN ELONGATE MEMBERIN SUBSTANTIALLY THE SHAPE OF A SECTOR OF A HOLLOW CYLINDER, HAVING ANEXTERIOR CONVEX SURFACE AND AN INTERIOR CONCAVE SURFACE, SAID SURFACESBEING BOUNDED BY SIDE SURFACES DEFINING THE EDGE OF SAID SECTOR; ATAPERED PORTION FROM THE CONVEX EXTERIOR SURFACE PROXIMATE AN END OF THESECTOR TO THE CONCAVE INTERIOR SURFACE AT SAID END OF THE SECTOR, SAIDTAPER BEING RADIALLY DISPOSED AND DEFINING A CUTTING EDGE, AND A FLATPORTION TAPERING FROM THE EXTERIOR SURFACE TO THE INTERIOR SURFACE, SAIDFLAT PORTION BEING SUBSTANTIALLY PARALLEL TO A TANGENT TO THE SURFACESAND DEFINING AN ADDITIONAL CUTTING EDGE ALONG THE INTERIOR SURFACE.